Simulink Mux parameters

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Eric Zanghi
Eric Zanghi 2011-8-30
Hi,
I trying to use the value of Mux block output(2 in --> 1 out) in a .m file(my program). I´ve try 'get_param' with parameter 'Value' without success. What the right parameter to read the value in my program. I´m expecting that the value is a vector with 2 elements.Right ?
Thanks Eric
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Fangjun Jiang
Fangjun Jiang 2011-8-30
What do you mean by "use the value of Mux block output"? Mux block is for signal routing for the most part. Are you trying to get the value of the signal at the outport of the Mux block from your M-script while the simulation is running?
Eric Zanghi
Eric Zanghi 2011-9-1
Yes! Exactly, I want to use the vector 'u' in M-script while the simulating is running.
I have many muxes, so, the idea is get this value from each block and update the correspondent variable in M-script.

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Fangjun Jiang
Fangjun Jiang 2011-9-1
It is not particularly related to the Mux block. You are looking for a way to get the dynamic signal data from a Simulink block while the simulation is running. See this post http://www.mathworks.com/matlabcentral/answers/14061-get-value-from-simulink-model-to-matlab-gui-while-simulink-is-running for the method. There are several steps involved. See link from TMW.
http://www.mathworks.com/help/toolbox/simulink/slref/add_exec_event_listener.html
http://www.mathworks.com/help/toolbox/simulink/ug/f13-92122.html
I would recommend that you not to get the signal data from the Mux block. Instead, you should try to get the signal data from its source, such as a Gain block, or a Sum block where the signal is created. Mux block in many cases is used for signal routing.
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Fangjun Jiang
Fangjun Jiang 2011-9-2
OMG! I believe R12 doesn't have that!

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Eric Zanghi
Eric Zanghi 2011-9-3
The best solution, that attend old versions of ML to, is include S-Function pointing to a Function that you can manipulate the S-Function block DATA (Outputs) and carrie extra variables as parameters. Ex: S-Function block 'Extra' parameters = gcb --> Carrie the block path to inside of the function.
Thanks for all answers and comments that I received ! Eric

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